src/network-live.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #include <sys/socket.h>
  25 #include <sys/types.h>
  26 #include <netinet/in.h>
  27 #include <netdb.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <inttypes.h>
  34 #include <fcntl.h>
  35 #include <sys/mman.h>
  36
  37 #include "lttng-viewer-abi.h"
  38 #include "network-live.h"
  39 #include "liblttng-live.h"
  40
  41 #include <babeltrace/babeltrace.h>
  42 #include <babeltrace/ctf/events.h>
  43 #include <babeltrace/ctf/callbacks.h>
  44 #include <babeltrace/ctf/iterator.h>
  45
  46 /* for packet_index */
  47 #include <babeltrace/ctf/types.h>
  48
  49 #include <babeltrace/ctf/metadata.h>
  50 #include <babeltrace/ctf-text/types.h>
  51 #include <babeltrace/ctf/events-internal.h>
  52 #include <lib/babeltrace/ctf/ctf-index.h>
  53
  54 /*
  55  * hostname parameter needs to hold NAME_MAX chars.
  56  */
  57 static
  58 int parse_url(const char *path, struct lttng_live_ctx *ctx)
  59 {
  60         char remain[3][NAME_MAX];
  61         int ret = -1, proto, proto_offset = 0;
  62         size_t path_len = strlen(path);
  63
  64         /*
  65          * Since sscanf API does not allow easily checking string length
  66          * against a size defined by a macro. Test it beforehand on the
  67          * input. We know the output is always <= than the input length.
  68          */
  69         if (path_len > NAME_MAX) {
  70                 goto end;
  71         }
  72         ret = sscanf(path, "net%d://", &proto);
  73         if (ret < 1) {
  74                 proto = 4;
  75                 /* net:// */
  76                 proto_offset = strlen("net://");
  77         } else {
  78                 /* net4:// or net6:// */
  79                 proto_offset = strlen("netX://");
  80         }
  81         if (proto_offset > path_len) {
  82                 goto end;
  83         }
  84         /* TODO : parse for IPv6 as well */
  85         /* Parse the hostname or IP */
  86         ret = sscanf(&path[proto_offset], "%[a-zA-Z.0-9%-]%s",
  87                 ctx->relay_hostname, remain[0]);
  88         if (ret == 2) {
  89                 /* Optional port number */
  90                 switch (remain[0][0]) {
  91                 case ':':
  92                         ret = sscanf(remain[0], ":%d%s", &ctx->port, remain[1]);
  93                         /* Optional session ID with port number */
  94                         if (ret == 2) {
  95                                 ret = sscanf(remain[1], "/%s", remain[2]);
  96                                 /* Accept 0 or 1 (optional) */
  97                                 if (ret < 0) {
  98                                         goto end;
  99                                 }
 100                         }
 101                         break;
 102                 case '/':
 103                         /* Optional session ID */
 104                         ret = sscanf(remain[0], "/%s", remain[2]);
 105                         /* Accept 0 or 1 (optional) */
 106                         if (ret < 0) {
 107                                 goto end;
 108                         }
 109                         break;
 110                 default:
 111                         fprintf(stderr, "[error] wrong delimitor : %c\n",
 112                                 remain[0][0]);
 113                         ret = -1;
 114                         goto end;
 115                 }
 116         }
 117
 118         if (ctx->port < 0)
 119                 ctx->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
 120
 121         if (strlen(remain[2]) == 0) {
 122                 printf_verbose("Connecting to hostname : %s, port : %d, "
 123                                 "proto : IPv%d\n",
 124                                 ctx->relay_hostname, ctx->port, proto);
 125                 ret = 0;
 126                 goto end;
 127         }
 128         ret = sscanf(remain[2], "host/%[a-zA-Z.0-9%-]/%s",
 129                         ctx->traced_hostname, ctx->session_name);
 130         if (ret != 2) {
 131                 fprintf(stderr, "[error] Format : "
 132                         "net://<hostname>/host/<traced_hostname>/<session_name>\n");
 133                 goto end;
 134         }
 135
 136         printf_verbose("Connecting to hostname : %s, port : %d, "
 137                         "traced hostname : %s, session name : %s, "
 138                         "proto : IPv%d\n",
 139                         ctx->relay_hostname, ctx->port, ctx->traced_hostname,
 140                         ctx->session_name, proto);
 141         ret = 0;
 142
 143 end:
 144         return ret;
 145 }
 146
 147 static int lttng_live_open_trace_read(const char *path)
 148 {
 149         int ret = 0;
 150         struct lttng_live_ctx *ctx;
 151
 152         ctx = g_new0(struct lttng_live_ctx, 1);
 153         ctx->session = g_new0(struct lttng_live_session, 1);
 154
 155         /* We need a pointer to the context from the packet_seek function. */
 156         ctx->session->ctx = ctx;
 157
 158         /* HT to store the CTF traces. */
 159         ctx->session->ctf_traces = g_hash_table_new(g_direct_hash,
 160                         g_direct_equal);
 161         ctx->port = -1;
 162         ctx->session_ids = g_array_new(FALSE, TRUE, sizeof(uint64_t));
 163
 164         ret = parse_url(path, ctx);
 165         if (ret < 0) {
 166                 goto end_free;
 167         }
 168
 169         ret = lttng_live_connect_viewer(ctx);
 170         if (ret < 0) {
 171                 fprintf(stderr, "[error] Connection failed\n");
 172                 goto end_free;
 173         }
 174         printf_verbose("LTTng-live connected to relayd\n");
 175
 176         ret = lttng_live_establish_connection(ctx);
 177         if (ret < 0) {
 178                 goto end_free;
 179         }
 180         printf_verbose("Listing sessions\n");
 181         ret = lttng_live_list_sessions(ctx, path);
 182         if (ret < 0) {
 183                 fprintf(stderr, "[error] List error\n");
 184                 goto end_free;
 185         }
 186
 187         if (ctx->session_ids->len > 0)
 188                 lttng_live_read(ctx);
 189
 190 end_free:
 191         g_hash_table_destroy(ctx->session->ctf_traces);
 192         g_free(ctx->session);
 193         g_free(ctx->session->streams);
 194         g_free(ctx);
 195         return ret;
 196 }
 197
 198 static
 199 struct bt_trace_descriptor *lttng_live_open_trace(const char *path, int flags,
 200                 void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
 201                         int whence), FILE *metadata_fp)
 202 {
 203         struct ctf_text_stream_pos *pos;
 204
 205         switch (flags & O_ACCMODE) {
 206         case O_RDONLY:
 207                 /* OK */
 208                 break;
 209         case O_RDWR:
 210                 fprintf(stderr, "[error] lttng live plugin cannot be used as output plugin.\n");
 211                 goto error;
 212         default:
 213                 fprintf(stderr, "[error] Incorrect open flags.\n");
 214                 goto error;
 215         }
 216
 217         pos = g_new0(struct ctf_text_stream_pos, 1);
 218         pos->parent.rw_table = NULL;
 219         pos->parent.event_cb = NULL;
 220         pos->parent.trace = &pos->trace_descriptor;
 221         lttng_live_open_trace_read(path);
 222         return &pos->trace_descriptor;
 223
 224 error:
 225         return NULL;
 226 }
 227
 228 static
 229 int lttng_live_close_trace(struct bt_trace_descriptor *td)
 230 {
 231         struct ctf_text_stream_pos *pos =
 232                 container_of(td, struct ctf_text_stream_pos,
 233                         trace_descriptor);
 234         free(pos);
 235         return 0;
 236 }
 237
 238 static
 239 struct bt_format lttng_live_format = {
 240         .open_trace = lttng_live_open_trace,
 241         .close_trace = lttng_live_close_trace,
 242 };
 243
 244 static
 245 void __attribute__((constructor)) lttng_live_init(void)
 246 {
 247         int ret;
 248
 249         lttng_live_format.name = g_quark_from_static_string("lttng-live");
 250         ret = bt_register_format(&lttng_live_format);
 251         assert(!ret);
 252 }
 253
 254 static
 255 void __attribute__((destructor)) lttng_live_exit(void)
 256 {
 257         bt_unregister_format(&lttng_live_format);
 258 }